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class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2019-11-08T09:09:55.000Z" title="发表于 2019-11-08 17:09:55">2019-11-08</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-09-07T09:44:01.889Z" title="更新于 2023-09-07 17:44:01">2023-09-07</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/myblog/categories/java/">java</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="MordenJava02"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div><article class="post-content" id="article-container"><h1 id="简单讨论下this的用法"><a href="#简单讨论下this的用法" class="headerlink" title="简单讨论下this的用法"></a>简单讨论下this的用法</h1><p>我喜欢直接上代码,一些解释也放在代码的注解里了:</p>
<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line"></span><br><span class="line">public class MeaningOfThis &#123;</span><br><span class="line"></span><br><span class="line">  public final int value = 4;</span><br><span class="line"></span><br><span class="line">  public void doIt() &#123;</span><br><span class="line">    int value = 6;</span><br><span class="line">//    因为doIt是在MeaningOfThis这个类里面的,</span><br><span class="line">//    所以这个this的范围就是MeaningOfThis类里定义的属性</span><br><span class="line">    System.out.println(this.value);</span><br><span class="line">    Runnable r = new Runnable() &#123;</span><br><span class="line">// 这个里面是Runnable的实现方法.可以想象成另一个类,</span><br><span class="line">// 所以这里面的this就指代这个实现方法里定义的属性,</span><br><span class="line">// 这个时候需要引用外部的属性只能直接打属性名</span><br><span class="line">      public final int value = 5;</span><br><span class="line">      @Override</span><br><span class="line">      public void run() &#123;</span><br><span class="line">        int value = 10;</span><br><span class="line">        System.out.println(this.value);</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;;</span><br><span class="line">    r.run();</span><br><span class="line">  &#125;</span><br><span class="line">  public static void main(String... args) &#123;</span><br><span class="line">    MeaningOfThis m = new MeaningOfThis();</span><br><span class="line">    m.doIt(); // ???</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p><strong>output:</strong></p>
<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">4</span><br><span class="line">5</span><br></pre></td></tr></table></figure>

<h1 id="利用函数式接口玩玩文件"><a href="#利用函数式接口玩玩文件" class="headerlink" title="利用函数式接口玩玩文件"></a>利用函数式接口玩玩文件</h1><p>直接代码:</p>
<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line"> private static final String FILE = ExecuteAround.class.getResource(&quot;./data.txt&quot;).getFile();</span><br><span class="line"> public static String processFileLimited() throws IOException &#123;</span><br><span class="line">//    这里需要切记一点.一定不要把项目放在有中文路径的地方.如果有中文FileReader会直接报错</span><br><span class="line">    try (BufferedReader br = new BufferedReader(new FileReader(FILE)))&#123;</span><br><span class="line">      return br.readLine();</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
<ol>
<li><p>这里定义一个静态属性FILE.<code>./data.txt</code> 意思当前类所在的目录中的data.txt.</p>
</li>
<li><p><code>getFile</code>方法获取文件路径字符串.</p>
</li>
<li><p><code>try()&#123;&#125;</code> 这种写法叫做资源句式.以前怎么写完会在finally里面进行关闭资源.用这种句式自动关闭资源.但是需要资源类实现AutoCloseable这个接口.BufferedReader继承Reader,然后Reader实现了这个接口的父接口,也就是实现了这个接口</p>
</li>
</ol>
<p><strong>一定要注意注释中写的.不要把路径放到有中文的目录中,那样的路径<code>FileReader</code>报异常</strong></p>
<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line"></span><br><span class="line">  public interface BufferedReaderProcessor &#123;</span><br><span class="line">    String process(BufferedReader b) throws IOException;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  public static String processFile(BufferedReaderProcessor p) throws IOException &#123;</span><br><span class="line">    System.out.println(FILE);</span><br><span class="line">    try (BufferedReader br = new BufferedReader(new FileReader(FILE))) &#123;</span><br><span class="line">      return p.process(br);</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line"> public static void main(String... args) throws IOException &#123;</span><br><span class="line">  String twoLines = processFile((BufferedReader b) -&gt; b.readLine() + b.readLine());</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<ol>
<li><p>首先一来定义个函数式接口.<code>BufferedReaderProcessor</code></p>
</li>
<li><p>定义静态方法processFile(BufferedReaderProcessor p),参数就是定义的函数式接口.这意味着<code>return p.process(br);</code>这个接口的方法实现可以由参数传入.</p>
</li>
<li><p><code>processFile((BufferedReader b) -&gt; b.readLine() + b.readLine())</code> 使用lambda表达式传递进去方法.就是读两行.<br>这就是process(br)的实现方法.</p>
</li>
</ol>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="https://zhangbo4881820.gitee.io/myblog">brad 随风起舞</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://zhangbo4881820.gitee.io/myblog/posts/59967/">https://zhangbo4881820.gitee.io/myblog/posts/59967/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://zhangbo4881820.gitee.io/myblog" target="_blank">静待花开</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/myblog/tags/java/">java</a></div><div class="post_share"><div class="social-share" 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